Zhanbusinova, B., Shaykhmetova, B. and Zhanbolova, A. (2015) “Operator method of solving differential-difference equations of first order”, Bulletin of the Karaganda University. Mathematics Series, 79(3), pp. 40–43. Available at: http://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/45 (Accessed: 7 September 2025).